MS3 Diff fluid?

I have a few easy questions for some of you that have worked on a few of these:
1) Our MS3 Trans is completely different than MS6 trans, right? I only ask because as I am searching for answers to my other questions, I am only finding info for MS6. It got me to wondering if the MS6 has the same trans but with a power take off for the transfer case and rear output...

2) Our Diff sits in a different part of the trans case than our gears and has it's own lubricant, correct? If so, how often should we be changing that lube? I have 145K miles and it has never been changed; I have changed my trans fluid twice but never the diff. I don't see any mention of changing the Diff fluid anywhere in the owners manual... but it also does not mention changing the Manual trans fluid either.

3) If I do need to change my diff fluid, how much and what kind?

4) How long should I expect my clutch to last? Again, I'm at 145K and no clutch problems. This is BY FAR the longest lasting clutch I have ever had. I usually expect to replace a disc and surface a flywheel every 60-100k miles with my driving and this one is shockingly long lasting.

 

1) nearly identical, but with a PTO. The transfer case input shaft splines directly to the diff case.

2) no, same area sharing fluid. The transfer case (not a diff) is a totally separate unit.

3) n/a

4) depends on how you drive it.

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Awesome! Thanks!